Re: Merge and pipe channel assignment madness

Bouke / VideoToolShed <[email protected]> Fri, 8 Sep 2017 17:05:25 +0200
Newsgroups	gmane.comp.audio.sox
Message-ID	<[email protected]>

> On 08 Sep 2017, at 10:02, Jan Stary <[email protected]> wrote:
> 
> On Sep 07 21:31:53, [email protected] <mailto:[email protected]> wrote:
>>>>> https://we.tl/4XNMXikv0J
>>>>> Y:\sox-14-4-2\sox -M "| Y:\sox-14-4-2\sox J:\Torsten\tst\T72.WAV -p pad 0" "| Y:\sox-14-4-2\sox J:\Torsten\tst\T72.WAV -p pad 1" -b 24 J:\Torsten\tst\output.wav
>>>>> 
>>>>> The file has ch1 (a bit) static, ch2 silence, ch3 voice
>>>>> On merge, the input tracks are reversed (but other files behave random.)
>>>> 
>>>> With my installation of SoX, running
>>>> 
>>>> 	$ sox -M "|sox T72.WAV -p pad 0" "|sox T72.WAV -p pad 1" output.wav
>>>> 
>>>> creates an output file with 6 channels, containing (in this order):
>>>> 
>>>> 	1 static
>>>> 	2 silence
>>>> 	3 voice
>>>> 	4 static
>>>> 	5 silence
>>>> 	6 voice
>>> 
>>> Hi Jan,
>>> Yeah, that’s what I would expect :-)
>>> 
>>>> so I still cannot reproduce your problem.
>>>> I also tried with the "-b 24" which should be irrelevant - no change.
>>>> 
>>>> Can you please also upload your output file?
>>> 
>>> Sure, here you go:
>>> https://we.tl/lRpO2tMTxu
>> 
>> Listening to this file with "play output.wav remix 1" etc, I hear:
>> 
>> 	1 silence
>> 	2 voice
>> 	3 static
>> 	4 silence
>> 	5 voice
>> 	6 static
>> 
>> Note that the channels are not "reversed" as you said, it's 2 3 1.
>> Can you also try with two different 3ch files to see
>> if it behaves consistently?
>> 
>>> I must say, I’ve only checked in Audacity, but I doubt that would matter...
> 
> Just to be sure: using Audacity, you do hear the very same
> in the channels as I describe above, right?
> 

Hi Jan,
I’ve tested also Avid and WaveAgent,
Output is definitely wrong!
I’ll test some more and look at it with a HEX editor, see if samples are missing.
(But I need to generate some testfiles first…)

Bouke


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